Hartline, 26, led the Dolphins with 74 receptions and 1,083 yards last season. Both were career highs for the Ohio State product. He had one TD reception.

He has 183 career receptions and six scores.

Hartline would have become an unrestricted free agent Tuesday but wanted to remain with the team that drafted him in 2009.

Even with Hartline re-signed, the Dolphins likely will look to add a top free-agent wide receiver, according to the South Florida Sun Sentinel. Mike Wallace and Greg Jennings are two possible targets, according to the paper.